Help on garage project...
Getting ready to install insulated ceiling in my garage. The firewall between house and garage goes floor to ceiling with no exposed 2x4 on which to attach the insulation, or drywall. So I have to put up a 2x4 up and attach it.
Question is, can I mount it (with long screws) on top of the existing drywall, or should I cut the drywall out and mount the 2x4 directly to the underlying wood?
I know the drywall is extra thick and fire retardant. (a 2 hour wall as I understand it), so I don't know if I can legally break through the drywall, or if there is some appropriate way to handle this?
The more I do, the less I accomplish.